feat: SentenceTransformersDocumentEmbedder

[anakin87]

Related Issues

• part of Sentence Transformers Embedders (v2) #5567

Proposed Changes:

Introduce the SentenceTransformersDocumentEmbedder, a component that embeds a list of Documents.
The embedding of each Document is stored in the embedding field of the Document.
See the Embedders proposal.

How did you test it?

Some unit tests.

Notes for the reviewer

Depends on #5572
It's only a first draft.

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[dfokina]

jFYI – commited tiny docstrings updates directly

[ZanSara]

✔️

[coveralls]

Pull Request Test Coverage Report for Build 5998783082

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.07%) to 48.248%

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Files with Coverage Reduction	New Missed Lines	%
utils/context_matching.py	1	95.7%

Totals
Change from base Build 5998738637:	0.07%
Covered Lines:	11453
Relevant Lines:	23738

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💛 - Coveralls